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CHARLES izfiirzirmiiiirzi lIUNliERllalARK, OF'PARIS RANCE, ASSIGNOR.

re iria' yiriiioi inri'ozwr, or ZRUNSWICK, GERMANY.

Fl *iiii-WlUOF 'MATERiALn .ilpplicgiilou filed January 31, 1899.

To In, 7137mm, 1'1 m rry (n/1 0111%:

Be it. knoxyn um], GIL-511L163 LEWIS Himm- MA NN or: llUNDlClR'lfliItll-Ui, engineer, a citizen of tho United Slams oi Amer-lee, residing at, 24; A ven no Mnclrlzil'zon, Paris, France, lizwe invented newmul woeful Improvements in Fire proof lllziiierials, of which the f )ilo'wing is specification.

The principal oojeei; oi int. invention is to proviile a, fireproof n'iziterial for proieoting buildings and the like as much as possible against injury in ease o; lire. i

It is well-known that the plosiez' ceilings, partitions, &c.,whieh are new used in all oonsin-notions are no protoebion whoboverfor the llOlLbCtLlOIS earl Steel framework with which American houses are built. Wit-ii a fire in the next house the lac-oi, ilz' ihis Lire is one ol.

, ten or twelve hours duration, is so intense,

that both neighbors houses, by the torsion, contraction, or extension of all the framework, and. particularly of tire rafters supporliing the eeiliugs,r1re uiiierly ruined by the folling of Walls and ceilings.

A brick or stone of my new fireproof mate rial or oompom'ul when. put into the fire and left therefor twenty hours olzows on the surface only a very thin layer of eio loi's of about one-sixteenth of on i no thickness, and whom broken open is cold inside, the heating of the outside wall of the atone never penetrating more than bli'rooalourtiie of r" i212]: r nd. 0t being intense. 'ihorofore may iron or steel bar covered with filiroe inclleeof my now material could never be touclre-rl by any change of temperature.

The composition of said material is as followszooe hundred kilograms of winter, ferryfive to sixty kilogro'me of plosberfinoly' crushed and "well calcined, ono to four kilograms oif pulverizoal Erylrzmlio limo, Son to twenty gems of euliurie sic-id ill) 56" .ilmim. Sai l substances heir i -ll m ixe, I ec'ici ton to twentydiveper eerie, of nl'ieir hotel Weight of SPEOILEISATIGN foaming; port of Lei/tors Potent No. 623,247, dated April 18, 11899.

Serial No. 704,030. on: specimens.)

and thoroughly mix the whole. I then add to blie mixture for each one hundred kilograms of water four been to twenty kilograms; of sand sawdust, slag, waste of wood, cork, &e., or

pens lo be at hand. The mixture is than molded into sheets, blocks, or stories ofzmysize or proportions and dried in the open oir, and when dryis ready for use. It can be employed for erecting walls, parSit-ions, or .53 any kind of lining for iron or steel bearers or framework, orwlfen making ceilings and the like the mixture; as aforesaid, of the differout subst'ances is made in a tub in very'liq- Hid for-inland pile liquid then poured between 60 the rafters or any other skeleton frame.

I am aware that it has been proposed to niako bricks 01' stones composed in on analogous manner; but they are not in any way. fireproof, so that they cannot answer my pm" 55 poseo I oloimos my invontion- A fireproof material composed elf on'e hundred kilograms of water, forty-fivo to sixty four kilograms of finely-pulverized hydrau-- lie lime, ten to twenty grams of sulfuric acid at 56 'Bnum, ton to twenty-five, per 00111;. of the total weight of aforesaid components of ohlorid of magnesium or equivalent, and '15 finally for each one hundred kilograms 0i. Weber, fourteen to twenty kilograms of any vaiuoless residue or waste, substantially as and for the purpose set forth. r

In testimony that I'elaim the foregoing as 8:; my invention I have signed my name, in presonce of two witnesses, this 13th day of Jam ary, 1899.

Oil. .11. lllllllillilillll DE HUNDERTMARK.

Witnesses: i v 1 EDW'ARD P. MAQLEAN, ALoIoLE FARE.

ehlorid of magnesium orzm'y equivalent agents 45' 0 my other i nertand eheapresiduo which hep- 5o kilograms of plaster finely crushed, one to I It is hereby certified that Letters Patent No. 623,247, granted April 18, 1899, upon the eppiicatien of Charles L. Heermzmn (1e Hundertmark, of Paris, France, for an improvement in Fireproof Materiel, waserroneously issued to Wilhelm Hepbst, of

Brunswick, Germany, as ass nee of the entire interest in said invention; that said Letters Patent .iuouldhave been issued to Emil Thm'neyssen, of same place, said Emil] Thurneyssen being the assignee by mesne assignments, of the entire interest in said patent, as shown by the fecord of assignments in this Ofiice; and that the said Letters Patent should be read with this eel-section therein that the same may conform to the reeo dofthe ease in t'he Patent Office.

Correctimi in Letters Patent Ne 623,2 47.'

Signed, cOuntersignmLmnl sealed this 26 day of May, A. D., 1899.

[SEALJ WEBSTER DAVIS,

' Assistant Sam-awry of the Interior. Countersigned 4 O. H. DUYELL,

(,bvmm'ssioner f Patents. 

